Research of the influence of the fractured rock massif on the coefficient of structural weakening
The main characteristics of rocks, which determine their strength indicators, are presented, and it is stated that, in the vast majority, the compressive strength limit is used in the calculations. Factors affecting the strength and stability of a heterogeneous rock massif are given and it is indica...
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| Format: | Article |
| Language: | English |
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Zhytomyr Polytechnic State University
2022-12-01
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| Series: | Технічна інженерія |
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| Online Access: | http://ten.ztu.edu.ua/article/view/269363 |
| Summary: | The main characteristics of rocks, which determine their strength indicators, are presented, and it is stated that, in the vast majority, the compressive strength limit is used in the calculations. Factors affecting the strength and stability of a heterogeneous rock massif are given and it is indicated that rock fracture is a determining indicator of the strength of the entire massif, which can be taken into account by the coefficient of structural weakening or its foreign analogues. According to the results of the analysis of various approaches and methods of establishing the coefficient of structural weakening of the rocky mountain massif and their foreign counterparts, it is proposed to divide them into three groups. The first group is recommended to include tabular and graphical methods of determining the coefficient of structural weakening depending on the rock formation. The second group can be composed of analytical formulas for determining this coefficient only by the value of the fracture modulus of rocks. The third group includes expressions for calculating the coefficient of structural weakening, which, in addition to cracking, contain additional factors that affect the strength of the rock massif.
For the first two groups, a combination of all the presented graphic dependencies of the numerical values of the structural weakening coefficient on the fracture modulus of the rock massif is combined on one graph. The laws of their change were established and a general dependence was constructed as a result of their approximation, for which an analytical expression in the form of a polynomial of the 3rd degree was obtained. The selection of the approximation curve is carried out for the conditions of obtaining the maximum value of the approximation reliability indicator, which in a successful case is 0.891. It was found that two dependencies emerge from the general nature of the changes, which, for low- and medium-cracked rocks, show a more intense decrease in the coefficient of structural weakening. After excluding them from the general analysis, the maximum reliability of the approximation was 0.9383. |
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| ISSN: | 2706-5847 2707-9619 |